Buying A House With Old Electrics

What's happening?

When buying a property, the surveyor may flag concerns about the electrical installation. Common red flags include an old consumer unit with rewirable fuses, visible outdated wiring (fabric-insulated or lead-sheathed), lack of RCD protection, or evidence of DIY electrical work. These findings do not necessarily mean the house is unsafe, but they indicate the electrics may need upgrading.

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What usually causes it?

• Property has its original electrical installation from the 1950s–1970s and has never been rewired
• Consumer unit still has rewirable fuses instead of modern MCBs
• Surveyor identified fabric-insulated (rubber/cotton) wiring at visible points
• No evidence of RCD protection on any circuits
• Visible signs of amateur or DIY electrical modifications

Is it dangerous?

Old electrics are not automatically dangerous, but they may lack modern safety features like RCD protection and may have deteriorated insulation. The risk depends on the age and condition of the installation. A property with wiring from the 1960s that has been well maintained and upgraded with a modern consumer unit may be perfectly safe. A property with original untouched wiring from the same era is more concerning.

Can I fix it myself?

You should not attempt any electrical assessment or work yourself. Before completing the purchase, commission an EICR from a qualified electrician. This will give you a definitive assessment of the installation's condition and identify exactly what work (if any) is needed. Use the EICR findings to negotiate the purchase price or request the seller carries out remedial work.

When should you call an electrician?

Call an electrician for an EICR before you exchange contracts on the purchase. This gives you leverage to negotiate. If the EICR reveals significant work is needed, you can factor the cost into your offer or ask the seller to address the issues before completion.

What will the electrician actually do?

• Carry out a pre-purchase Electrical Installation Condition Report (EICR)
• Test all circuits, protective devices, earthing, and bonding
• Identify the age and type of wiring and assess its remaining lifespan
• Code all defects and provide a clear report of what needs attention
• Provide a detailed quote for any remedial work so you can factor it into negotiations

Who fixes this

• Pre-purchase electrical survey
• EICR

What it usually costs

EICR Cost

£100–£330

Questions people ask

Sources & References

1. BS 7671: IET Wiring Regulations (18th Edition)
2. NICEIC: Householder Guidance
3. Electrical Safety First: Safety Guidance